TFS757 datasheet(4/36 Pages) POWERINT

4 / 36 page

Rev. E 04/15

TFS757-764HG

www.power.com

Table 2.

Summary of Differences Between HiperTFS and Other Typical High Power Supplies.

Function

Typical Two-Switch

Forward

HiperTFS

Advantages of HiperTFS

Nominal Duty Cycle

33%

45%

Wider duty cycle reduces RMS switch currents by 17%.

Reduces R

DS(ON) losses by 31%

Maximum Duty Cycle

<50%

63%

Switch Current (RMS)

100%

83%

Output Catch Diode

O + VD/DMAX

Lower losses. Wider D

MAX lowers catch diode rating by

(1-(50%/63%)) = 21% reduction in catch diode voltage

rating

Clamp Voltage

Reset diodes from zero

to V

Reset from zero to

IN + 130)

With fast/slow diode combination, allows charge

recovery to limit high-side C

OSS loss

Thermal Shutdown

---

118 °C Shutdown /

55 °C hysteresis

HiperTFS provides integrated OTP device protection

Current Sense Resistor

0.5 V drop (0.33

W at

300 W)

Sense resistor not

required

Improved efficiency. MOSFET R

DS(ON) sense eliminated

need for sense resistor

High-Side Drive

Requires gate-drive

transformer (high cost)

Built in high-side drive

Lower cost; component elimination. Removes

high-cost gate-drive transformer (EE10 or toroid)

Component Count

Higher

Lower

Saves up to 50 components, depending on specification.

TinySwitch Overload Power

Compensation vs. Input Voltage

---

Built-in compensation

Safer design; easier to design power supply. Flattens

overload output power over line voltages

Package Creepage

TO-220 = 1.17 mm

eSIP16/12 = 2.3 mm/

3.3 mm

HiperTFS meets functional safety spacing at package

pins

Package Assembly

2 × TO-220 package, 2

× SIL (insulation)

1 Package

No SIL (insulation) pad required

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